/*
 * Copyright 2020 eBlocker Open Source UG (haftungsbeschraenkt)
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be
 * approved by the European Commission - subsequent versions of the EUPL
 * (the "License"); You may not use this work except in compliance with
 * the License. You may obtain a copy of the License at:
 *
 *   https://joinup.ec.europa.eu/page/eupl-text-11-12
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package org.eblocker.server.http.utils;

import java.text.Normalizer;

public class NormalizationUtils {

    public NormalizationUtils() {
        // TODO Auto-generated constructor stub
    }

    public static String normalizeStringForShellScript(String dirty) {
        String clean = Normalizer.normalize(dirty, Normalizer.Form.NFD).replaceAll("\\s+", "_")
                .replaceAll("[^a-zA-Z0-9_]", "");
        return clean;
    }
    
    public static String normalizeStringForFilename(String dirty, int maxLength, String defaultClean) {
        if (dirty == null) {
            return defaultClean;
        }
        String clean;
        clean = Normalizer.normalize(dirty, Normalizer.Form.NFD).replaceAll("\\s", "_").replaceAll("[^a-zA-Z0-9_]", "");
        if (clean.length() > maxLength) {
            clean = clean.substring(0, maxLength);
        } else if (clean.length() == 0) {
            clean = defaultClean;
        }
        return clean;
    }
}
